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  linux常用命令
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  <h2 id="Linux里利用grep和find查找文件内容"><a href="#Linux里利用grep和find查找文件内容" class="headerlink" title="Linux里利用grep和find查找文件内容"></a>Linux里利用grep和find查找文件内容</h2><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line">Linux里利用grep和find查找文件内容</span><br><span class="line">1、从文件内容查找匹配指定字符串的行：</span><br><span class="line">$ grep “被查找的字符串” 文件名</span><br><span class="line">例子：在当前目录里第一级文件夹中寻找包含指定字符串的.in文件</span><br><span class="line">grep “thermcontact” /.in</span><br><span class="line"></span><br><span class="line">2、从文件内容查找与正则表达式匹配的行：</span><br><span class="line">$ grep –e “正则表达式” 文件名</span><br><span class="line"></span><br><span class="line">3、查找时不区分大小写：</span><br><span class="line">$ grep –i “被查找的字符串” 文件名</span><br><span class="line"></span><br><span class="line">4、查找匹配的行数：</span><br><span class="line">$ grep -c “被查找的字符串” 文件名</span><br><span class="line"></span><br><span class="line">5、从文件内容查找不匹配指定字符串的行：</span><br><span class="line">$ grep –v “被查找的字符串” 文件名</span><br><span class="line"></span><br><span class="line">6、从根目录开始查找所有扩展名为.log的文本文件，并找出包含”ERROR”的行</span><br><span class="line">find / -type f -name “*.log” | xargs grep “ERROR”</span><br><span class="line">例子：从当前目录开始查找所有扩展名为.in的文本文件，并找出包含”thermcontact”的行</span><br><span class="line">find . -name “*.in” | xargs grep “thermcontact”</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<h2 id="linux下进程号查看和pid查看端口号"><a href="#linux下进程号查看和pid查看端口号" class="headerlink" title="linux下进程号查看和pid查看端口号"></a>linux下进程号查看和pid查看端口号</h2><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line">1.  根据进程pid查端口：</span><br><span class="line"></span><br><span class="line">     lsof -i | grep pid</span><br><span class="line"></span><br><span class="line">2.  根据端口port查进程（某次面试还考过）：</span><br><span class="line"></span><br><span class="line">    lsof  -i:port     </span><br><span class="line"></span><br><span class="line">3. 根据进程pid查端口：</span><br><span class="line"></span><br><span class="line">   netstat -nap | grep pid</span><br><span class="line"></span><br><span class="line">4.  根据端口port查进程</span><br><span class="line"></span><br><span class="line">   netstat -nap | grep port</span><br><span class="line"></span><br><span class="line"> 从形式上看， netstat -nap 更好记忆， 但lsof的用法也要熟练。</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<h1 id="Linux查看所有Java进程"><a href="#Linux查看所有Java进程" class="headerlink" title="Linux查看所有Java进程"></a>Linux查看所有Java进程</h1><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">ps -ef | grep java | grep -v grep </span><br><span class="line"></span><br><span class="line">使用awk分割结果，获取PID</span><br><span class="line">ps -ef | grep java | grep -v grep | awk &#x27;&#123;print $2&#125;&#x27;</span><br><span class="line"></span><br><span class="line">ps -ef | grep java | grep -v grep | awk &#x27;&#123;print $2&#125;&#x27; | xargs kill -9</span><br><span class="line"></span><br></pre></td></tr></table></figure>





<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br></pre></td><td class="code"><pre><span class="line">复制代码</span><br><span class="line"># 总核数 = 物理CPU个数 X 每颗物理CPU的核数 </span><br><span class="line"># 总逻辑CPU数 = 物理CPU个数 X 每颗物理CPU的核数 X 超线程数</span><br><span class="line"></span><br><span class="line"># 查看物理CPU个数</span><br><span class="line">cat /proc/cpuinfo| grep &quot;physical id&quot;| sort| uniq| wc -l</span><br><span class="line"></span><br><span class="line"># 查看每个物理CPU中core的个数(即核数)</span><br><span class="line">cat /proc/cpuinfo| grep &quot;cpu cores&quot;| uniq</span><br><span class="line"></span><br><span class="line"># 查看逻辑CPU的个数</span><br><span class="line">cat /proc/cpuinfo| grep &quot;processor&quot;| wc -l</span><br><span class="line">复制代码</span><br><span class="line"> 查看CPU信息（型号）</span><br><span class="line">cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c</span><br><span class="line"></span><br><span class="line"> </span><br><span class="line"></span><br><span class="line">查看内存信息</span><br><span class="line"># cat /proc/meminfo</span><br><span class="line"></span><br><span class="line"> </span><br><span class="line"></span><br><span class="line">如何查看Linux 内核</span><br><span class="line">uname -a</span><br><span class="line">cat /proc/version</span><br><span class="line"></span><br><span class="line"> </span><br><span class="line"></span><br><span class="line">查看机器型号（机器硬件型号）</span><br><span class="line"></span><br><span class="line">dmidecode | grep &quot;Product Name&quot;</span><br><span class="line">dmidecode</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">如何查看linux 系统版本</span><br><span class="line">cat /etc/redhat-release</span><br><span class="line">lsb_release -a</span><br><span class="line">cat  /etc/issue</span><br><span class="line"> </span><br><span class="line">如何查看linux系统和CPU型号，类型和大小</span><br><span class="line">cat /proc/cpuinfo</span><br><span class="line"></span><br><span class="line">如何查看linux 系统内存大小的信息，可以查看总内存，剩余内存，可使用内存等信息  </span><br><span class="line">cat /proc/meminfo</span><br></pre></td></tr></table></figure>



<h1 id="Linux-x2F-Mac下统计当前文件夹下的文件个数、目录个数"><a href="#Linux-x2F-Mac下统计当前文件夹下的文件个数、目录个数" class="headerlink" title="Linux&#x2F;Mac下统计当前文件夹下的文件个数、目录个数"></a>Linux&#x2F;Mac下统计当前文件夹下的文件个数、目录个数</h1><p>这篇文章主要介绍了Linux下统计当前文件夹下的文件个数、目录个数,本文使用ls命令配合管理、grep命令实现统计需求,需要的朋友可以参考下 不好意思，为了不让该帖子沉下去，造福需要改机的机友们，所以加上了回复才能查看的内容。</p>
<p>1.统计当前文件夹下文件的个数<br><code>ls -l |grep &quot;^-&quot;|wc -l</code></p>
<p>2、 统计当前文件夹下目录的个数<br><code>ls -l |grep &quot;^d&quot;|wc -l</code><br>3、 统计当前文件夹下文件的个数，包括子文件夹里的<br><code>ls -lR|grep &quot;^-&quot;|wc -l</code><br>4、统计文件夹下目录的个数，包括子文件夹里的<br><code>ls -lR|grep &quot;^d&quot;|wc -l</code></p>
<ol>
<li>说明</li>
</ol>
<blockquote>
<p>代码如下:</p>
</blockquote>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ls -l</span><br></pre></td></tr></table></figure>

<p>长列表输出当前文件夹下文件信息(注意这里的文件，不同于一般的文件，可能是目录、链接、设备文件等)</p>
<p>代码如下:</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">grep &quot;^-&quot;</span><br></pre></td></tr></table></figure>

<p>这里将长列表输出信息过滤一部分，只保留一般文件，如果只保留目录就是 ^d<br>代码如下:</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">wc -l</span><br></pre></td></tr></table></figure>

<p>统计输出信息的行数，因为已经过滤得只剩一般文件了，所以统计结果就是一般文件信息的行数，又由于一行信息对应一个文件，所以也就是文件的个数。</p>
 
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<script src="/js/lazyload.min.js"></script>

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    headingSelector: "h1, h2, h3, h4, h5, h6",
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    scrollContainer: "main",
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    positionFixedClass: "is-position-fixed",
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<script src="/dist/main.js"></script>

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    <div class="pswp__bg"></div>

    <!-- Slides wrapper with overflow:hidden. -->
    <div class="pswp__scroll-wrap">

        <!-- Container that holds slides. 
            PhotoSwipe keeps only 3 of them in the DOM to save memory.
            Don't modify these 3 pswp__item elements, data is added later on. -->
        <div class="pswp__container">
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
        </div>

        <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
        <div class="pswp__ui pswp__ui--hidden">

            <div class="pswp__top-bar">

                <!--  Controls are self-explanatory. Order can be changed. -->

                <div class="pswp__counter"></div>

                <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>

                <button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>

                <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>

                <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>

                <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                <!-- element will get class pswp__preloader--active when preloader is running -->
                <div class="pswp__preloader">
                    <div class="pswp__preloader__icn">
                        <div class="pswp__preloader__cut">
                            <div class="pswp__preloader__donut"></div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                <div class="pswp__share-tooltip"></div>
            </div>

            <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
            </button>

            <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
            </button>

            <div class="pswp__caption">
                <div class="pswp__caption__center"></div>
            </div>

        </div>

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</div>

<link rel="stylesheet" href="https://cdn.staticfile.org/photoswipe/4.1.3/photoswipe.min.css">
<link rel="stylesheet" href="https://cdn.staticfile.org/photoswipe/4.1.3/default-skin/default-skin.min.css">
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<script src="https://cdn.staticfile.org/photoswipe/4.1.3/photoswipe-ui-default.min.js"></script>

<script>
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        let pswpElement = document.querySelectorAll('.pswp')[0];
        let $imgArr = document.querySelectorAll(('.article-entry img:not(.reward-img)'))

        $imgArr.forEach(($em, i) => {
            $em.onclick = () => {
                // slider展开状态
                // todo: 这样不好，后面改成状态
                if (document.querySelector('.left-col.show')) return
                let items = []
                $imgArr.forEach(($em2, i2) => {
                    let img = $em2.getAttribute('data-idx', i2)
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                    image.src = src
                    items.push({
                        src: src,
                        w: image.width || $em2.width,
                        h: image.height || $em2.height,
                        title: title
                    })
                })
                var gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, {
                    index: parseInt(i)
                });
                gallery.init()
            }
        })
    }
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</script> 
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<link rel="stylesheet" href="/css/clipboard.css">
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      var copyHtml = '';
      copyHtml += '<button class="btn-copy" data-clipboard-snippet="">';
      copyHtml += '<i class="ri-file-copy-2-line"></i><span>COPY</span>';
      copyHtml += '</button>';
      $(".highlight .code pre").before(copyHtml);
      $(".article pre code").before(copyHtml);
      var clipboard = new ClipboardJS('.btn-copy', {
        target: function(trigger) {
          return trigger.nextElementSibling;
        }
      });
      clipboard.on('success', function(e) {
        let $btn = $(e.trigger);
        $btn.addClass('copied');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-checkbox-circle-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPIED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-checkbox-circle-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
      clipboard.on('error', function(e) {
        e.clearSelection();
        let $btn = $(e.trigger);
        $btn.addClass('copy-failed');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-time-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPY FAILED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-time-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
    }
    initCopyCode();
  }(window, document);
</script>
 
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